先前基于宏观电磁波(包含大量光子)的实验已经证明，光前驱是光脉冲在传播过程中最快的部分。
Previous experiments based on macroscopic electromagnetic wave propagation (involving lots of photons) have shown that the optical precursor is the fastest part in the propagation of an optical pulse.
介绍了D JY - 2000b型地震电磁波脉冲观测系统的组成、工作原理、主要功能和技术指标等。
The structure, principle of working, primary functions and technical features of the Observation System of DJY-2000B Seismic Electromagnetic Impulse are introduced.
本课题详细分析了船舶导航雷达的工作原理，包括电磁波工作特性、脉冲雷达基本原理以及雷达定位的工作原理。
The operation principle of marine navigation radar is deeply analyzed in this project, including the basic principle of radio, impulse radar and radio-range orientation.
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